SOLR Fix Invalid UTF-8 during post

getting error while posting xml need help fixing this <lst name="responseHeader"><int name="status">400</int><int name="QTime">547</int></lst><lst name="error"><str name="msg">Invalid UTF-8 middle byte 0x6f (at char #140824, byte #139263)</str><int name="code">400</int></lst> </response> SimplePostTool: WARNING: IOException while reading response: [login to view URL]: Server returned HTTP response code: 400 for URL: http://localhost:8983/solr/gettingstarted/update 1 files indexed.